Donoso "Oso" Camacho is Nate Adams' close friend and classmate at Springdale Elementary, maintaining strong bonds with Eddie Archer and Katie Forester. His thuggish appearance—a robust build, dark rings around his eyes, spiky black hair, and a plaster on his left cheek—belies a gentle, slightly bumbling personality. He typically sports a blue varsity jacket with white sleeves, a white shirt featuring a triangular design, brown shorts, and white sneakers, creating a rebellious biker-like aesthetic that clashes with his true nature. Oso exhibits a simple personality but demonstrates deep care for his friends. As the class prankster, he engages in mischievous behavior despite lacking athleticism and being known for his gluttony. He displays unusual sensitivity, often bursting into tears, and harbors a significant fear of his mother. He shares a love of soccer with Nate and Eddie. His background and development unfold through specific media events: - In the "Ring in the Pond" game chapter, he tasks Nate with retrieving his parents' lost engagement ring from a pond. - During "The Extreme Dare," he becomes trapped inside an anatomical model by the Yo-kai Rattelle after accidentally taking one of her rib bones; he is freed once the bone is located in his desk. - The quest "Re-Mom-Bear Me" involves him seeking help to remind his mother to make dinner, revealing she was inspirited by the Yo-kai Wazzat. After Wazzat's defeat, his mother remembers dinner—and a poor test score, leading to her reprimanding him. - In *Yo-kai Watch 2*, quests ("Bear Boy - Origins," "The Bear Boy Returns," "Ultimate Bear Boy") depict his attempts to act as a superhero. These result in mishaps: using Mochismo's power causes him to fall into a river; Nekidspeed's influence makes him collide with his mother; and Supoor Hero leads to a rooftop clash with Eddie. Each incident concludes with his mother scolding him, and in the last, he notes Eddie's mother is "scarier." - In an alternate universe, exposure to the Kuroi Yo-kai Watch transforms him into the Yo-kai Mukade-otoko. In the anime films, he appears in group discussions about strange events in *Yo-kai Watch: The Movie*. In *The Great Adventure of the Flying Whale & the Double World, Nyan!*, he is portrayed via live-action and acquires a rare Emperor Krills toy from a crank-machine. Eddie attempts to buy it, leading to negotiation where Oso offers a "friendship discount," though Eddie lacks sufficient funds. Nate observes that Oso resembles a 30-year-old man during this encounter. Trivia notes include his crush on Lulu being revealed when Katie is inspirited by the Yo-kai Espy. He experiences fewer inspiriting incidents compared to his friend group. His Spanish localization name is "Donoso 'Oso' Camacho."